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Numerical Expressions for Ventilation Parameters.

Ventilation '85, Proceedings of the 1st International Symposium on Ventilation for Contaminant Control, Toronto, Canada, October 1-3, 1985 1986:623-632

Link

NIOSHTIC No.

00228767

Abstract

Using numerical analysis (computerized simulation) for designing industrial ventilation systems was discussed. The use of microcomputers and their limitations for designing ventilation systems were considered. The widespread availability of microcomputers has enabled creation and automation of design parameters for industrial ventilation systems; however, this frequently requires downloading large quantities of tabulated empirical data and performing a large number of calculations using the data. This has imposed severe limits on some of the slower microcomputers and their software. It has been frequently observed that it is faster to look up a relevant value in a table than to download the table and calculate it. It was proposed that in order to avoid this type of problem, the needed parameters be numerically approximated instead. To obtain numerical approximations, the parameters should be separated into external and systemic variables. Examples of external variables include psychometric parameters that are used to correct ventilation system designs for the effects of vapors, altitude, and temperature and traditional heating and air conditioning variables. Systemic variables include velocity pressures and pressure losses in ductwork components and elbow and junctional losses for specified flow rates and duct sizes. Examples of calculations for determining these parameters were presented.